I'm trying to make a function similar to the wallpaper engine, by adding a child window to the Progman window. The function did allow me to add the video, however, the window size is fixed, which made me unable to fit the video to the entire desktop.
I tried to change the window size, but neither MoveWindow nor SetWindowPos worked. The Progman's hwnd Rect is just screen size (1920x1080), so it's not a boundary issue. The video window size is 640x480. I'm able to change the location of the window, meaning no permission issue, just can't change the size of it.
Here is the code.
LPCWSTR lpParam = L" videoTest2.mp4 -noborder -fs -loop 0";
STARTUPINFO si{ 0 };
PROCESS_INFORMATION pi{ 0 };
if (CreateProcess(L"ffplay.exe", (LPWSTR)lpParam, 0, 0, 0, 0, 0, 0, &si, &pi)) {
Sleep(200);
HWND hProgram = FindWindow(_T("Progman"), _T("Program Manager"));
HWND hFfplay = FindWindow(L"SDL_app", 0);
SetParent(hFfplay, hProgram);
// MoveWindow(hFfplay, 0, 0, 3840, 1080, true);
SetWindowPos(hFfplay, NULL, 0, 0, 3840, 1080, SWP_NOZORDER);
ShowWindow(hFfplay, SW_MAXIMIZE);
EnumWindows(EnumWindowProc, (LPARAM)SW_HIDE);
Sleep(1000);
EnumWindows(EnumWindowProc, (LPARAM)SW_SHOW);
}
else {
std::cout << GetLastError() << std::endl;
}
EnumWindowProc is just for showing and hiding system background images.
I am really confused. :(
Here is a new property sheet:
#include "stdafx.h"
#include "resource.h"
#include "VisitsRotaMFCPropertySheet.h"
CVisitsRotaMFCPropertySheet::CVisitsRotaMFCPropertySheet()
:CResizingMFCPropertySheet(_T("VisitsRota"), AFX_IDS_APP_TITLE, nullptr, 0)
{
ConstructSheet();
}
CVisitsRotaMFCPropertySheet::~CVisitsRotaMFCPropertySheet()
{
}
BOOL CVisitsRotaMFCPropertySheet::OnInitDialog()
{
BOOL bResult = CResizingMFCPropertySheet::OnInitDialog();
m_Menu.LoadMenu(IDR_MENU);
SetMenu(&m_Menu);
return bResult;
}
void CVisitsRotaMFCPropertySheet::ConstructSheet()
{
m_psh.dwFlags |= PSH_NOAPPLYNOW;
AddPage(&m_ElderlyInfirmPage);
AddPage(&m_ShepherdingPage);
}
It is derived from CResizingMFCPropertySheet. This is the source for that class:
https://www.dropbox.com/s/fzpfo4c3dpt6l51/ResizingMFCPropertySheet.cpp?dl=0
Now, I have two pages in this window. Here is one for the definitions:
IDD_PAGE_ELDERLY_INFIRM DIALOGEX 0, 0, 420, 202
STYLE DS_SETFONT | DS_FIXEDSYS | WS_CHILD | WS_CAPTION
CAPTION "Elderly && Infirm"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
GROUPBOX "Elders ...",IDC_STATIC,6,7,132,188
LISTBOX IDC_LIST_BOOKSTUDY,12,18,120,147,LBS_SORT | LBS_NOINTEGRALHEIGHT | WS_VSCROLL | WS_TABSTOP
PUSHBUTTON "Add",IDC_BUTTON_ADD_GROUP,12,172,35,18
PUSHBUTTON "Edit",IDC_BUTTON_EDIT_ELDER,55,172,35,18
PUSHBUTTON "Delete",IDC_BUTTON_DELETE_GROUP,97,172,35,18
GROUPBOX "Publishers ...",IDC_STATIC,144,7,132,188
LISTBOX IDC_LIST_ELDERY_INFIRM,150,18,120,147,LBS_SORT | LBS_NOINTEGRALHEIGHT | WS_VSCROLL | WS_TABSTOP
PUSHBUTTON "Add",IDC_BUTTON_ADD_ELDERLY,150,172,35,18
PUSHBUTTON "Edit",IDC_BUTTON_EDIT_ELDERLY,193,172,35,18
PUSHBUTTON "Delete",IDC_BUTTON_DELETE_ELDERLY,235,172,35,18
GROUPBOX "Report Settings ...",IDC_STATIC,281,7,132,188
LTEXT "Starting month:",IDC_STATIC,286,18,120,8
COMBOBOX IDC_COMBO_MONTH,286,31,120,12,CBS_DROPDOWNLIST | WS_VSCROLL | WS_TABSTOP
LTEXT "Number of months:",IDC_STATIC,286,49,78,12
COMBOBOX IDC_COMBO_NUM_MONTHS,376,49,30,96,CBS_DROPDOWNLIST | WS_VSCROLL | WS_TABSTOP
LTEXT "Number of publishers to visit each month:",IDC_STATIC_NUM_PUB,286,65,84,18
COMBOBOX IDC_COMBO_PUB_PER_MONTH,376,66,30,12,CBS_DROPDOWNLIST | CBS_SORT | WS_VSCROLL | WS_TABSTOP
LTEXT "Starting publisher:",IDC_STATIC,286,90,120,8
COMBOBOX IDC_COMBO_PUBLISHER,286,103,120,12,CBS_DROPDOWNLIST | CBS_SORT | WS_VSCROLL | WS_TABSTOP
END
It is correctly set up as a page and I have initially set the control data via the IDE:
IDD_PAGE_ELDERLY_INFIRM AFX_DIALOG_LAYOUT
BEGIN
0,
0, 0, 0, 100,
0, 0, 0, 100,
0, 100, 0, 0,
0, 100, 0, 0,
0, 100, 0, 0,
0, 0, 0, 100,
0, 0, 0, 100,
0, 100, 0, 0,
0, 100, 0, 0,
0, 100, 0, 0,
100, 0, 0, 100,
100, 0, 0, 0,
100, 0, 0, 0,
100, 0, 0, 0,
100, 0, 0, 0,
100, 0, 0, 0,
100, 0, 0, 0,
100, 0, 0, 0,
100, 0, 0, 0
END
I have adjusted my CDialog application to invoke the property sheet instead. The sheet itself sizes:
Why is the sheet control not automatically resizing? I just don't get it. My other application uses the same base class and yet all those property pages correctly resizing the controls etc using the dynamic layout features.
Update
I added this to one of my pages:
void CElderlyInfirmPage::OnSize(UINT nType, int cx, int cy)
{
CMFCPropertyPage::OnSize(nType, cx, cy);
AfxMessageBox(_T("Size"));
// TODO: Add your message handler code here
auto pManager = GetDynamicLayout();
if (pManager != nullptr)
{
AfxMessageBox(_T("Valid"));
}
}
It confirms that the "page" does not actually have a dynamic layout manager. Only the sheet does. So I think the problem is the fact that we can't use dynamic layout mechanism.
Update 2
I made some progress. Example:
It turns out that the property page doesn't seem to load the dynamic layout resources like it does for a dialog. I started to create it manually:
BOOL CElderlyInfirmPage::OnInitDialog()
{
CMFCPropertyPage::OnInitDialog();
// TODO: Add extra initialization here
ReadSettings();
InitMonthCombo();
// Init to THIS month
COleDateTime datNow = COleDateTime::GetCurrentTime();
m_cbMonth.SetCurSel(datNow.GetMonth()-1);
EnableDynamicLayout(TRUE);
auto pManager = GetDynamicLayout();
if (pManager != nullptr)
{
pManager->Create(this);
pManager->AddItem(IDC_COMBO_MONTH, CMFCDynamicLayout::MoveHorizontal(100), CMFCDynamicLayout::SizeNone());
pManager->AddItem(IDC_COMBO_NUM_MONTHS, CMFCDynamicLayout::MoveHorizontal(100), CMFCDynamicLayout::SizeNone());
pManager->AddItem(IDC_COMBO_PUB_PER_MONTH, CMFCDynamicLayout::MoveHorizontal(100), CMFCDynamicLayout::SizeNone());
pManager->AddItem(IDC_COMBO_PUBLISHER, CMFCDynamicLayout::MoveHorizontal(100), CMFCDynamicLayout::SizeNone());
}
return TRUE; // return TRUE unless you set the focus to a control
// EXCEPTION: OCX Property Pages should return FALSE
}
As you can see, the controls move now so it is progress. But the problem now is that I have a lot of IDC_STATIC controls on these pages and I don't want to change the ID numbers. This is because the application already has translations for localization and if I change the ID values I blow up the translations. So I am wondering if I can use the [CMFCDynamicLayout::LoadResource][3] method to load the complete settings from the RC file. But I can't work out how to call LoadResource here. I am sure it would be the answer to this question.
Update 3
I just traced the code and if you look here:
LRESULT CPropertySheet::HandleInitDialog(WPARAM, LPARAM)
{
LRESULT lResult = OnInitDialog();
CMFCDynamicLayout* pDynamicLayout = GetDynamicLayout();
if (pDynamicLayout != NULL)
{
CRect rectWindow;
GetWindowRect(rectWindow);
m_sizeMin = rectWindow.Size();
for (CWnd *pChild = GetWindow(GW_CHILD); pChild->GetSafeHwnd() != NULL; pChild = pChild->GetWindow(GW_HWNDNEXT))
{
HWND hwndChild = pChild->GetSafeHwnd();
if (!pDynamicLayout->HasItem(hwndChild))
{
if (pChild->SendMessage(WM_GETDLGCODE) & DLGC_BUTTON)
{
pDynamicLayout->AddItem(hwndChild, CMFCDynamicLayout::MoveHorizontalAndVertical(100, 100), CMFCDynamicLayout::SizeNone());
}
else if (IsLeftNavigationPane(hwndChild))
{
pDynamicLayout->AddItem(hwndChild, CMFCDynamicLayout::MoveNone(), CMFCDynamicLayout::SizeVertical(100));
}
else if (DYNAMIC_DOWNCAST(CPropertyPage, pChild) == NULL || CanAddPageToDynamicLayout())
{
pDynamicLayout->AddItem(hwndChild, CMFCDynamicLayout::MoveNone(), CMFCDynamicLayout::SizeHorizontalAndVertical(100, 100));
}
}
}
}
return lResult;
}
It does not seem to actually work with the layout properly.
I tried to use:
LoadDynamicLayoutResource(m_lpszTemplateName);
And I traced it. It eventually ended up here:
BOOL CMFCDynamicLayout::LoadResource(CWnd* pHostWnd, LPVOID lpResource, DWORD dwSize)
{
if (pHostWnd->GetSafeHwnd() == NULL || !::IsWindow(pHostWnd->GetSafeHwnd()) || lpResource == NULL)
{
return FALSE;
}
CMFCDynamicLayoutData layoutData;
BOOL bResult = layoutData.ReadResource(lpResource, (UINT)dwSize);
layoutData.ApplyLayoutDataTo(pHostWnd, FALSE);
return bResult;
}
It failed on the ApplyLayoutDataTo call, on the first if statement:
BOOL CMFCDynamicLayoutData::ApplyLayoutDataTo(CWnd* pHostWnd, BOOL bUpdate)
{
if (pHostWnd->GetSafeHwnd() == NULL || m_listCtrls.IsEmpty())
{
return FALSE;
}
ASSERT_VALID(pHostWnd);
pHostWnd->EnableDynamicLayout(FALSE);
pHostWnd->EnableDynamicLayout();
m_listCtrls.IsEmpty() was empty. So it hadn't read it in properly anyway.
I think I have no choice but to assign IDs to all my controls, even the static ones and manually build the dynamic layout up. Unless you have other ideas.
Dynamic layout is already be enabled for all classes derived from CDialog which call the default CDialog::OnInitDialog, which in turn uses CMFCDynamicLayout::LoadResource to read resizing information for child controls.
That include CMFCPropertyPage. The information is already loaded, so if you call EnableDynamicLayout it deletes the existing object and creates a new one. Just remove the call to EnableDynamicLayout.
This way pManager->Create(this); won't be necessary, but you can keep it in there. It won't do anything because pManager already created and the method knows not to create twice.
CPropertySheet does require EnableDynamicLayout and pManager->Create. PropertySheet cannot be designed in dialog editor, so MFC ignores resizing for its child windows. Dynamic resizing has to be implemented manually.
MCVE:
class CMyPage : public CMFCPropertyPage
{
CButton bn;
BOOL OnInitDialog()
{
CMFCPropertyPage::OnInitDialog();
//add test button dynamically
bn.Create(L"Test", WS_CHILD | WS_VISIBLE, CRect(0, 0, 100, 30), this, 301);
auto pManager = GetDynamicLayout();
if(pManager != nullptr)
{
pManager->AddItem(bn.GetDlgCtrlID(),
CMFCDynamicLayout::MoveHorizontal(100),
CMFCDynamicLayout::SizeNone());
}
return TRUE;
}
};
class CMySheet :public CMFCPropertySheet
{
public:
CMyPage Page1;
CMySheet()
{
Page1.Construct(IDD_PAGE1);
AddPage(&Page1);
}
static int CALLBACK XmnPropSheetCallback(HWND hWnd, UINT message, LPARAM lParam)
{
extern int CALLBACK AfxPropSheetCallback(HWND, UINT message, LPARAM lParam);
// XMN: Call MFC's callback
int nRes = AfxPropSheetCallback(hWnd, message, lParam);
if (message == PSCB_PRECREATE)
((LPDLGTEMPLATE)lParam)->style |= (DS_3DLOOK | DS_SETFONT
| WS_THICKFRAME | WS_SYSMENU | WS_POPUP | WS_VISIBLE | WS_CAPTION);
return nRes;
}
BOOL OnInitDialog()
{
BOOL res = CMFCPropertySheet::OnInitDialog();
EnableDynamicLayout(TRUE);//required for propertysheet
auto pManager = GetDynamicLayout();
if(pManager)
{
pManager->Create(this);
for(CWnd *child = GetWindow(GW_CHILD);
child; child = child->GetWindow(GW_HWNDNEXT))
{
if(child->SendMessage(WM_GETDLGCODE) & DLGC_BUTTON)
pManager->AddItem(*child,
CMFCDynamicLayout::MoveHorizontalAndVertical(100, 100),
CMFCDynamicLayout::SizeNone());
else
pManager->AddItem(*child,
CMFCDynamicLayout::MoveNone(),
CMFCDynamicLayout::SizeHorizontalAndVertical(100, 100));
}
}
return res;
}
INT_PTR DoModal()
{
// Hook into property sheet creation code
m_psh.dwFlags |= PSH_USECALLBACK;
m_psh.pfnCallback = XmnPropSheetCallback;
return CMFCPropertySheet::DoModal();
}
};
...
CMySheet sh;
sh.DoModal();
It is a bit difficult to provide you with a minimal working example here but I am going to try and explain this issue that I have only just noticed.
The Context
So, I have a regular CDialogEx derived class, defined like this:
class CChristianLifeMinistryStudentsDlg : public CDialogEx
I have set it up so that the borders will not resize:
The main application (also CDialogEx based) has a fixed window. That behaves correct.
From the menu the user displays a resizable dialogue (an editor).
On this dialog is a button the user can press which will in turn display the popup modal dialog I am referring to.
What Happens
When this dialog is displayed I have noticed this when you hover the mouse over the dialog borders:
I don't understand why this is happening.
Cursor Management
In the "editor" that spawns this popup window I do have some cursor management like this:
BOOL CChristianLifeMinistryEditorDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
if (CPersistentWaitCursor::WaitCursorShown())
{
RestoreWaitCursor();
return TRUE;
}
return CDialogEx::OnSetCursor(pWnd, nHitTest, message);
}
But, I have tried temporarily to invoke this popup from my main application dialog which does not have an cursor management and the result is still the same.
Spy Results
As requested I have just used Spy to examine the window styles:
As anticipated we suddenly have WS_THICKFRAME set, when it was not in the resource editor!
So
In my RC file the dialog has the DS_MODALFRAME flag set but at runtime it ends up having the WS_THICKFRAME set. As far as I am aware I never make these changes for these affected dialog objects.
Update
I have found out the following:
BOOL CChristianLifeMinistryStudentsDlg::OnInitDialog()
{
LONG_PTR lStyle = GetWindowLongPtr(GetSafeHwnd(), GWL_STYLE);
if (lStyle & WS_THICKFRAME)
AfxMessageBox(_T("Thick"));
else if (lStyle & DS_MODALFRAME)
AfxMessageBox(_T("Modal"));
CDialogEx::OnInitDialog();
If I put the check code before the CDialogEx::OnInitDialog(); call the style is set as DS_MODALFRAME. But if I put the same check code after the CDialogEx::OnInitDialog(); call it is then changed to WS_THICKFRAME. Why?
OK
So, the CDialogEx::OnInitDialog method calls CWnd::LoadDynamicLayoutResource(LPCTSTR lpszResourceName). This in turn calls CWnd::InitDynamicLayout(). And in that method it does this:
if (!bIsChild && (pDialog != NULL || pPropSheet != NULL))
{
CRect rect;
GetClientRect(&rect);
ModifyStyle(DS_MODALFRAME, WS_POPUP | WS_THICKFRAME);
::AdjustWindowRectEx(&rect, GetStyle(), ::IsMenu(GetMenu()->GetSafeHmenu()), GetExStyle());
SetWindowPos(NULL, 0, 0, rect.Width(), rect.Height(), SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE | SWP_NOOWNERZORDER);
}
There we go. So it is because I am using CDialogEx as my base class. Is this a bug in MFC?
Clarification
The "Editor" (parent window of the popup that owns the button) does use dynamic layout functonality:
But in this instance the popup does not need to. But it is because my popup is derived from CDialogEx that this is happening.
The plot thickens
So this is the MFC code that is always called with CDialog::OnInitDialog:
BOOL CWnd::LoadDynamicLayoutResource(LPCTSTR lpszResourceName)
{
if (GetSafeHwnd() == NULL || !::IsWindow(GetSafeHwnd()) || lpszResourceName == NULL)
{
return FALSE;
}
// find resource handle
DWORD dwSize = 0;
LPVOID lpResource = NULL;
HGLOBAL hResource = NULL;
if (lpszResourceName != NULL)
{
HINSTANCE hInst = AfxFindResourceHandle(lpszResourceName, RT_DIALOG_LAYOUT);
HRSRC hDlgLayout = ::FindResource(hInst, lpszResourceName, RT_DIALOG_LAYOUT);
if (hDlgLayout != NULL)
{
// load it
dwSize = SizeofResource(hInst, hDlgLayout);
hResource = LoadResource(hInst, hDlgLayout);
if (hResource == NULL)
return FALSE;
// lock it
lpResource = LockResource(hResource);
ASSERT(lpResource != NULL);
}
}
// Use lpResource
BOOL bResult = CMFCDynamicLayout::LoadResource(this, lpResource, dwSize);
// cleanup
if (lpResource != NULL && hResource != NULL)
{
UnlockResource(hResource);
FreeResource(hResource);
}
if (bResult)
{
InitDynamicLayout();
}
return bResult;
}
For some reason this call BOOL bResult = CMFCDynamicLayout::LoadResource(this, lpResource, dwSize); is return TRUE. As a result the dialog eventually calls InitDynamicLayout. In my other dialogs that are popups this does not happen. Instead, bResult ends up as FALSE and thus the frame is not resized.
So why does it think it worked?
Worked it out. I don't remember doing this but for some reason some of my controls on the dialog had dynamic properties set. For example:
I had to set all of these properties back to None. Then it behaved.
You can easily tell if a given dialog resource has any dynamic properties by opening your resource file in a text editor. For example:
IDD_DIALOG_OUR_CHRISTIAN_LIFE_AND_MINISTRY_MATERIAL AFX_DIALOG_LAYOUT
BEGIN
0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 10, 0,
0, 0, 0, 0,
50, 0, 0, 0,
50, 0, 0, 0,
0, 0, 0, 0,
0, 0, 10, 0,
0, 0, 0, 0,
50, 0, 0, 0,
50, 0, 0, 0,
0, 0, 0, 0,
0, 0, 10, 0,
0, 0, 0, 0,
50, 0, 0, 0,
50, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0
END
If something like the above is present then your dialog will be deemed as having a dynamic layout, and thus the settings for the dialog are modified:
ModifyStyle(DS_MODALFRAME, WS_POPUP | WS_THICKFRAME);
The resource will look like this when it has no dynamic control properties:
IDD_DIALOG_OUR_CHRISTIAN_LIFE_AND_MINISTRY_MATERIAL AFX_DIALOG_LAYOUT
BEGIN
0
END
I chose to manually reset each control via the IDE. However, I guess you could modify the text file manually.
As to why I had controls with dynamic properties in the first place, well, I can't tell you. I might have been fiddling in the past with the dialog and not realised the side effect to the border frame. Or, possibly, I may have copied controls from one resource on to another and it carried the dyanmic values.
The interesing side note is that whilst the MFC code set the border as thick, it did not change it sufficiently to enable dialog resizing. But that is another matter!
At least we now know the cause of the issue and how to easily identify the dialogs in the resource that have dynamic layouts.
I have the following code which passes a window handler form OpenCV window to win32 handler, therefore I can show the grabbed images from camera to the screen and the images will show as a child window of my main API.
but the problem is that when I want to add a tooldbar to my program, the image window handler comes at the top of the toolbar. how can I sort this out?
//create a window and set the handler from openCV to win32
cv::namedWindow("test",cv::WINDOW_AUTOSIZE);
hWnd2 = (HWND) cvGetWindowHandle("test");
hParent = ::GetParent(hWnd2);
::SetParent(hWnd2, hWnd);
::ShowWindow(hParent, SW_HIDE);
_liveCapturing=true;
lastPicNr = 0;
SetWindowTextW(hStatus, L"Live Capturing ... ");
if(FullScreen()){
::ShowWindow(hWnd, SW_MAXIMIZE);
}
code for the toolbar :
HWND CreateToolbar(HWND hwnd){
HWND hTbar = CreateWindowEx(0, TOOLBARCLASSNAME, NULL, WS_CHILD | WS_VISIBLE | CCS_TOP , 0, 0, 0, 0, hwnd, (HMENU)12, GetModuleHandle(NULL), NULL);
SendMessage(hTbar, TB_BUTTONSTRUCTSIZE, (WPARAM)sizeof(TBBUTTON), 0);
TBBUTTON tbb[3];
TBADDBITMAP tbab;
tbab.hInst = HINST_COMMCTRL;
tbab.nID = IDB_STD_SMALL_COLOR;
SendMessage(hTbar, TB_ADDBITMAP, 0, (LPARAM)&tbab);
return hTbar;
}
Probably you have found the solution a long time ago, but i want to post my anwers in case other users need it.
You can simply add the OpenCV window with the same code you have to a child window in your window (which you set it position in advance). For example you can add it to a static text window (label) ...
If you want to move the OpenCV window, call SetWindowPos() with the desired coordinates.
SetWindowPos(hWnd2, 0, 0, 30, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
In a C++ app I create a button using CreateWindowEx and later try to change its position using SetWindowPos, but the button doesn't appear where I want it.
What's interesting is that when I resize the window (with the mouse, not programatically), I can see for a split second a blank silhouette the same size of the button where the button is supposed to appear. This must be because I also call SetWindowPos in response to window resizing events. However the actual button stays at the same location. I'd post a screenshot but for some reason the silhouette never shows up in screenshots.
This is the code that changes the X position (the code that changes the Y position is almost identical):
HRESULT Control::put_Left(float left)
{
RECT windowRect;
::GetWindowRect(m_hWnd, &windowRect);
if (m_isTopLevel)
{
BOOL bResult = ::SetWindowPos(
m_hWnd,
nullptr,
static_cast<int>(DesktopDpi::GetInstance().DipsToPixelsX(left)),
windowRect.top,
0,
0,
SWP_NOSIZE | SWP_NOZORDER | SWP_NOREPOSITION
);
if (!bResult)
return HRESULT_FROM_WIN32(::GetLastError());
}
else
{
// NOTE: for a button this is the code that will execute, because a
// button is not a top-level window
HWND hWndParent = ::GetParent(m_hWnd);
if (hWndParent == nullptr)
return HRESULT_FROM_WIN32(::GetLastError());
POINT parentPos = {0, 0};
if (!::ClientToScreen(hWndParent, &parentPos))
return E_FAIL;
BOOL bResult = ::SetWindowPos(
m_hWnd,
nullptr,
static_cast<int>(DesktopDpi::GetInstance().DipsToPixelsX(left)),
windowRect.top - parentPos.y,
0,
0,
SWP_NOSIZE | SWP_NOZORDER | SWP_NOREPOSITION
);
if (!bResult)
return HRESULT_FROM_WIN32(::GetLastError());
}
return S_OK;
}
Are you sure the parent of the button isn't moving it back to the old position when it handles WM_SIZE? It sure sounds like it from your description.